Hello Everyone,
I am trying to communicate between AD7190 and MSP432P401M controller through SPI communication. My issue is I can't read default register value from AD7190.
I have attached circuit diagram and code for your reference.
The connections are as follows:-
Pin no 13,14 -left open
PIn no. 17 to GND
pin no 22 (SYNC') tied to 3.3V
pin no. 5,6,7,8 left open
#include "msp.h"
#include "common.h"
#include "AD7730.h"
//**************SPI Initialization*******************//
void SPI_INT()
{
P1->SEL0 |= BIT4 | BIT5 | BIT6 | BIT7; // set 4-SPI pin as second function
EUSCI_B0->CTLW0 |= EUSCI_B_CTLW0_SWRST; // Put eUSCI state machine in reset
EUSCI_B0->CTLW0 = EUSCI_B_CTLW0_SWRST | // Remain eUSCI state machine in reset
EUSCI_B_CTLW0_MST | // Set as SPI master
EUSCI_B_CTLW0_SYNC | // Set as synchronous mode
EUSCI_B_CTLW0_MSB| // MSB first
EUSCI_B_CTLW0_MODE_2 | // 4-pin mode with slave enable when STE low
EUSCI_B_CTLW0_STEM | // STE mode select
EUSCI_B_CTLW0_SSEL__SMCLK; // SMCLK
// Clock polarity initially low
//data out on first rising edge
//data out on first falling edge
//this setting are according to AD7730 CLK_POL tie to ground or Zero
EUSCI_B0->BRW = 0x01; // /2,fBitCl0ock = fBRCLK/(UCBRx+1).
EUSCI_B0->CTLW0 &= ~EUSCI_B_CTLW0_SWRST; // Initialize USCI state machine
}
//*************SPI transmit*****************
void spi_tx(uint8_t txdata)
{
while(!(EUSCI_B0->IFG & EUSCI_B_IFG_TXIFG));
EUSCI_B0->TXBUF = txdata ;
}
//***********Function to write internal register
void WriteRegister(uint8_t W_address, int N_OF_Byte, int data)
{
/* local variable declaration */
int var32bit=data;
uint8_t var8bit1,var8bit2,var8bit3,var8bit4;
var8bit1 = var32bit; // Lower Order byte
var8bit2 = var32bit >> 8;
var8bit3 = var32bit >> 16;
var8bit4 = var32bit >> 24; // Higher Order Byte
spi_tx(W_address);
__delay_cycles (200);
if(N_OF_Byte==1)
{
spi_tx(var8bit1);
__delay_cycles (200);
}
if(N_OF_Byte==2)
{
spi_tx(var8bit2);
__delay_cycles (200);
spi_tx(var8bit1);
__delay_cycles (200);
}
if(N_OF_Byte==3)
{
spi_tx(var8bit3);
__delay_cycles (200);
spi_tx(var8bit2);
__delay_cycles (200);
spi_tx(var8bit1);
__delay_cycles (200);
}
if(N_OF_Byte==4)
{
spi_tx(var8bit4);
__delay_cycles (200);
spi_tx(var8bit3);
__delay_cycles (200);
spi_tx(var8bit2);
__delay_cycles (200);
spi_tx(var8bit1);
__delay_cycles (200);
}
}
//*************SPI Receive****************
int spi_rx()
{
uint8_t Data;
spi_tx(0x00); //send dummy data
__delay_cycles (200);
// Wait till a character is received
// while (!(EUSCI_B0->IFG & EUSCI_B_IFG_RXIFG));
Data = EUSCI_B0->RXBUF; // Move data to a temporary buffer
// Clear the receive interrupt flag
// EUSCI_B0->IFG &= ~EUSCI_B_IFG_RXIFG;
return Data;
}
//*****************function to single read internal resister**********//
int ReadRegister(uint8_t R_address,int N_OF_Byte)
{
/* local variable declaration */
int var32bit1,var32bit2,var32bit3;
spi_tx(R_address);
__delay_cycles (200);
if(N_OF_Byte==1)
{
var32bit1 = spi_rx();
return var32bit1;
}
else if(N_OF_Byte==2)
{
var32bit1=spi_rx(); // higher byte
__delay_cycles (200);
var32bit2=spi_rx(); // lower byte
var32bit1=var32bit1<<8;
var32bit1=var32bit1|var32bit2; // masking into 16 bit data
return var32bit1 ;
}
var32bit1=spi_rx(); //higher byte
__delay_cycles (200);
var32bit2=spi_rx(); //middle byte
__delay_cycles (200);
var32bit3=spi_rx(); //lower byte
var32bit1=var32bit1<<8;
var32bit2=var32bit1|var32bit2;
var32bit2=var32bit2<<8;
var32bit3=var32bit2|var32bit3; //masking into 24 bit data
return var32bit3;
}
//******************Read AD7730 Data*******************//
int ReadData()
{
/* local variable declaration */
int var32bit1,var32bit2,var32bit3;
var32bit1=spi_rx();
__delay_cycles (200);
var32bit2=spi_rx();
__delay_cycles (200);
var32bit3=spi_rx();
// data mapping
var32bit1=var32bit1<<8;
var32bit2=var32bit1|var32bit2;
var32bit2=var32bit2<<8;
var32bit3=var32bit2|var32bit3;
return var32bit3;
}
void main(void)
{
STATUS_Result1 = ReadRegister(COM_READ_STATUS_REG_CMD,1); // read DAC Register default value
__delay_cycles (2000);
}
